CN102594175B - Alternating current-to-direct current circuit - Google Patents
Alternating current-to-direct current circuit Download PDFInfo
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- CN102594175B CN102594175B CN201210056555.9A CN201210056555A CN102594175B CN 102594175 B CN102594175 B CN 102594175B CN 201210056555 A CN201210056555 A CN 201210056555A CN 102594175 B CN102594175 B CN 102594175B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4266—Arrangements for improving power factor of AC input using passive elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2176—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output
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Abstract
The invention discloses an alternating current-to-direct current circuit, comprising a rectifier circuit, a voltage detection circuit, a constant current source and an output circuit. The rectifier circuit rectifies the alternating current into pulse direct current; the constant current source provides current for a voltage detection output end of the voltage detection circuit and a control port of the output circuit, the current flowing in the constant current source is the sum of the current provided to the voltage detection circuit by the constant current source and the current provided to the output circuit by the constant current source; the voltage detection circuit rises along with the instantaneous value of the rectifier circuit, the more the current absorbed by the voltage detection output end of the voltage detection circuit is, the more the absorbed current of the constant current source is and the smaller the current provided for the control port of the output circuit by the constant current source is; and the output circuit amplifies the current of the control port and then outputs the current, and the output current provides power for the subsequent load of the alternating current-to-direct current circuit. The alternating current-to-direct current circuit can rectify the input voltage below the sine peak of the alternating current, works at a sine wave ascending area and a sine wave descending area respectively, and can carry capacitive load.
Description
Technical field
The present invention relates to AC-DC circuit, be particularly applied to the AC-DC circuit in small-power AC/DC power supply.
Background technology
AC-DC circuit is a lot, can realize with rectification circuit.Industry generally adopts Alternating Current Power Supply with folk power supply, and take civilian as example, China is 220VAC/50Hz, America adopts 120VA or 110VAC, the alternating current of 60Hz, and Britain adopts 240VAC/50Hz, other countries and regions are also different, all things considered, frequency is two kinds: 50Hz or 60Hz, and operating voltage is 110V left and right and 220V left and right, is characterized in, the direction intercropping cyclic variation at any time of the amplitude of voltage (or electric current), as shown in Figure 1.
The alternating current changing by sinusoidal rule in time shown in Fig. 1, is called alternation sinusoidal voltage, changes once the needed time to be called cycle of alternating voltage, represents with T, and the said 220V of industry, refers to effective value, and its peak value is
times effective value, is:
The not temporal evolution of size and Orientation of direct voltage (or electric current).As represented voltage with curve, be the straight line parallel with horizontal time axis, but we are generally constant direction, but the size of voltage (or electric current) in time to some extent change also referred to as direct voltage (or electric current).
Industrial and civilian all needs becomes exchange into direct current, first will make electric current one way flow, i.e. unilateal conduction, and then amplitude stabilization is got off, be i.e. filtering.The process that AC power is transformed into one direction power supply calls rectification.
In prior art, rectification circuit is generally divided into halfwave rectifier, full-wave rectification, bridge rectifier, voltage doubling rectifing circuit, rectification circuit is divided into single-phase and heterogeneous (as three-phase), refer generally to single phase rectifier circuit, in fact, single phase rectifier circuit known technology simple combination, getting final product should be on poly phase rectification electric current.
Shown in Fig. 2-1 is exactly half-wave rectifying circuit, if capacitor C L does not access, its output waveform is shown in Fig. 2-2, is Rectified alternating current; After capacitor C L access, its output waveform is in Fig. 2-3 shown in solid line, for comparatively level and smooth Rectified alternating current, after circuit stable state, only conducting in t1 to the t2 time in Fig. 2-3 of rectifier diode D1 in Fig. 2-1, capacitor C L is charged, by capacitor C L, load RL is discharged At All Other Times, if think, direct voltage is level and smooth, and capacitor C L will be very large, and capacitor C L strengthens, can cause the ON time of t1 to t2 very short, charging current is very big, and circuit also, only at the electric current of this time loss AC-input voltage, causes grid voltage waveform distortion." stabilized power supply " first edition in 1984 that the principle of this part also can be published with reference to People's Telecon Publishing House, standard book number is: 15045 total 2790-are without 6260, and the 33rd page of Fig. 2 4.1 of this book also fully shown this principle.
Shown in Fig. 3-1 is exactly full-wave rectifying circuit, generally cannot be directly used in commercial power rectification, generally to obtain through transformer that two groups of voltage is identical, the voltage (center tapped) of single spin-echo, just can use, if capacitor C L does not access, its output waveform is shown in Fig. 3-2, is Rectified alternating current; After capacitor C L access, its output waveform is in Fig. 3-3 shown in solid line, is comparatively level and smooth Rectified alternating current.After circuit stable state, only conducting in t1 to the t2 time in Fig. 3-3 of rectifier diode D1a in Fig. 3-1; And only conducting in t3 to the t4 time in Fig. 3-3 of rectifier diode D1b, when diode current flow, capacitor C L is charged, by capacitor C L, load RL is discharged At All Other Times, if think, direct voltage is level and smooth, and capacitor C L will be very large, and capacitor C L strengthens, can cause the ON time of t1 to t2 and t3 to t4 very short, charging current is very big, and circuit also, only at the electric current of this time loss AC-input voltage, causes grid voltage waveform distortion through transformer B1.The 35th page of Fig. 2 4.3 of " stabilized power supply " also fully shown this principle.Waveform after distortion is no longer sinusoidal wave, can Fourier transform a lot of high order harmonic components that are first-harmonic, high order harmonic component is exactly the interference source in power supply.
Shown in Fig. 4-1, Fig. 4-2, Fig. 4-3 is exactly bridge rectifier, and these three kinds of techniques of painting are all commonly used, and their annexation is consistent, and Fig. 4-2 are the simple and easy technique of painting.If capacitor C L does not access, identical shown in its output waveform and Fig. 3-2, be Rectified alternating current; After capacitor C L access, its output waveform is in Fig. 3-3 shown in solid line, is comparatively level and smooth Rectified alternating current.After circuit stable state, only conducting in t1 to the t2 time in Fig. 3-3 of rectifier diode D1a and rectifier diode D1c in Fig. 4-1 to Fig. 4-2; And only conducting in t3 to the t4 time in Fig. 3-3 of rectifier diode D1b and rectifier diode D1d, when diode current flow, capacitor C L is charged, by capacitor C L, load RL is discharged At All Other Times, if think, direct voltage is level and smooth, and capacitor C L will be very large, and capacitor C L strengthens, can cause the ON time of t1 to t2 and t3 to t4 very short, charging current is very big, and circuit also, only at the electric current of this time loss input voltage, causes grid voltage waveform distortion.The 35th page of Fig. 2 4.3 of " stabilized power supply " also fully shown this principle, and the 34th page the 3rd section illustrates: " for capacitor filtering full-wave rectification situation, according to Fig. 2 4.3, reader can analyze voluntarily.This analyzes and is also applicable to bridge rectifier.”
In above-mentioned halfwave rectifier, full-wave rectification, bridge rectifier, electric capacity withstand voltage is all greater than input voltage
doubly, 1.414 of input voltage times, exchange input for 220V, consider that line voltage is unstable, voltage often rises to 264V left and right, requires withstand voltage its peak value 373V that is all greater than of filter capacitor, consider to leave surplus, generally will get withstand voltage or 450V withstand voltage of 400V.
In sum, the rectification circuit of prior art, want to obtain level and smooth direct voltage, all to use filter capacitor, circuit only in the time that alternating current approaches peak value from civil power Absorption Current, a large amount of civil electric appliance, industrial equipment are all like this, in electrical network, sine voltage seriously distorts, voltage waveform shown in Fig. 5-1 is exactly East Industrial Park, development zone, Huangpu, Guangzhou morning on February 24th, 2012 8:17 divide the commercial power waveform of collection; Voltage waveform shown in Fig. 5-2, exactly with place morning on February 24th, 2012 8:39 divide the commercial power waveform of collection, now most factory goes to work; In order conveniently to see waveform, use rectification circuit without filter capacitor collection, can see from Fig. 5-2, along with the working of each factory starts electricity consumption, power consumption increases, and waveform is further distortion obviously, it is more smooth that top in Fig. 5-2 obviously becomes, and this is consistent with above-mentioned theory analysis.
Although the existing circuit of power factor correction that adopts addresses this problem at present, circuit of power factor correction is referred to as pfc circuit, it is the abbreviation of Power Factor Correction, adopt after rectification circuit, absorb from the interference spike in civil power with very little " filter capacitor ", as 0.1uF to 0.47uF, the later waveform of rectification is consistent with Fig. 3-2, the Switching Power Supply of recycling BOOST topology is raised to 400V left and right direct current voltage, give again other circuit supply, to realize High Power Factor, realize and do not cause grid voltage waveform distortion.
Use controllable silicon technology can realize not in the time that alternating current approaches summit Absorption Current from civil power, use controllable silicon in rectification circuit back, the waveform obtaining as in Figure 6-1,100 shades be after controllable silicon copped wave, export schematic diagram, its shortcoming is to be with large capacitive load, and can only be operated in the sloping portion of half-wave.Can not be with the principle of large capacitive load, can be referring to " three, inverted L shape filtering " of the 38th of " stabilized power supply " page to the word between 40 pages " four, the filtering of π type ".
Between rectification circuit and alternating current, use controllable silicon, the waveform obtaining is as shown in Fig. 6-2, current common triggering technique can produce the trigger point of positive half cycle and the trigger point of negative half period is asymmetric, show as in Fig. 6-2,100 shaded areas and 101 shaded areas are not etc., its shortcoming is to be with large capacitive load, is applicable to band resistive load or inductive load, and can only be operated in the sloping portion of half-wave.
In low-power applications occasion, the cost of pfc circuit is higher, still can not popularize.Small-power occasion, in AC-DC circuit, conventional rectification circuit in the time that alternating current approaches peak value from civil power Absorption Current, cause grid voltage waveform distortion and still exist.
Summary of the invention
Have in view of that, the technical problem to be solved in the present invention is, a kind of AC-DC circuit is provided, for the voltage that exchanges input, AC-DC circuit no longer when alternating current approaches sinusoidal peak value from alternating current Absorption Current, but from the following partial rectification of the sinusoidal peak value of alternating current, and be operated in respectively sinusoidal wave rising and decline region, and can be with capacitive load.
For solving the problems of the technologies described above, a kind of AC-DC circuit of the present invention, comprises rectification circuit, voltage detecting circuit, constant-current source, output circuit;
Described constant-current source provides electric current (flow into or flow out) to the control port of described voltage detecting circuit and described output circuit, the electric current sum that the electric current that the electric current flowing through in described constant-current source provides to described voltage detecting circuit for described constant-current source and described constant-current source provide to described output circuit;
Described voltage detecting circuit is along with Output Voltage in Rectified Circuits instantaneous value rises, the voltage detecting output Absorption Current of described voltage detecting circuit is larger, the electric current that described constant-current source provides to described voltage detecting circuit is absorbed manyly by described voltage detecting circuit, corresponding the reducing of electric current that described constant-current source provides to the control port of described output circuit;
Output after described output circuit provides electric current from described constant-current source to described output circuit control port amplifies.
More preferably, the output of described output circuit is also connected with a voltage detecting circuit, thereby realizes comparatively accurate output voltage stabilizing.
The present invention also provides the application of above-mentioned AC-DC circuit in AC/DC small-power power.
Operation principle of the present invention is, rectification circuit is Rectified alternating current commercial power rectification, the waveform of Rectified alternating current is shown in Fig. 2-2 or Fig. 3-2, voltage detecting circuit is along with Output Voltage in Rectified Circuits instantaneous value rises, the voltage detecting output Absorption Current of voltage detecting circuit is larger, the electric current of constant-current source is absorbed manyly, and constant-current source is less to the electric current of the control port of output circuit, and the output current of output circuit is exactly the electric current that amplifies its control port.Realized:
Less than predeterminated voltage value at Output Voltage in Rectified Circuits instantaneous value, the Absorption Current of voltage detecting output is less than the electric current of constant-current source, and the control port of output circuit has electric current to flow through, instantaneous voltage after output circuit output rectification;
Identical with predeterminated voltage value at Output Voltage in Rectified Circuits instantaneous value, the Absorption Current of voltage detecting output is identical with the electric current of constant-current source, and the control port of output circuit does not have electric current to flow through, output circuit no-output;
Larger than predeterminated voltage value at Output Voltage in Rectified Circuits instantaneous value, the Absorption Current of voltage detecting output is larger than the electric current of constant-current source, because the electric current of constant-current source no longer increases, voltage detecting output Absorption Current can only equate with the electric current of constant-current source, the control port of output circuit does not have electric current to flow through, output circuit no-output;
Predeterminated voltage value sets in advance littlely than the peak value of alternating current, the present invention has just realized no longer when alternating current approaches sinusoidal peak value Absorption Current from alternating current so, but from the following partial rectification of the sinusoidal peak value of alternating current, and can be operated in respectively sinusoidal wave rising and decline region.
In the time working in the voltage rising edge of half-wave, Output Voltage in Rectified Circuits instantaneous value is by little while approaching predeterminated voltage value, there is a descending change procedure in the electric current of the control port of output circuit, output after the inner amplification of output circuit, also there is a descending process, like this, owing to there not being jump signal, civil power is not just caused to interference.
When the voltage drop that works in half-wave along time, Output Voltage in Rectified Circuits instantaneous value is when approaching greatly predeterminated voltage value, the electric current of the control port of output circuit exist one by zero to little, the change procedure progressively increasing again, through output circuit is inner amplify after output, also exist one by zero to little, progressively increase again process, like this, owing to there not being jump signal, civil power is not just caused to interference.
The maximum output current of output circuit is limited in to predetermined current value, and so, the present invention is in the time starting shooting first, and the impulse current of generation is just in predetermined current value and following, thereby has effectively controlled the impulse current of start first.
Also just because of there is the process of a gradual change, so can be with capacitive load.
beneficial effect
Power to load (comprising subsequent conditioning circuit) only below the peak value of alternating current time due to circuit of the present invention, due to rectification circuit, voltage detecting circuit, constant-current source, output circuit can be made up of resistance and transistor, can not there is not any electric capacity, inductance, can realize Highgrade integration, realize AC-DC circuit with lower cost, and in circuit, can abandon high-voltage capacitance as high-voltage electrolytic capacitor, and power in start first, when start, there is no impulse current, after a large amount of parallel connections of multiple circuit units of the present invention, by a switch control, do not produce impulse current (surge current) yet, owing to not having bulky high pressure polarity free capacitor or high-voltage electrolytic capacitor, use various circuit of the present invention easily to realize miniaturization.
Accompanying drawing explanation
Fig. 1 is the ac power waveform figure changing by sinusoidal rule in time;
Fig. 2-1 is the circuit diagram of half-wave rectifying circuit;
Output voltage waveform when Fig. 2-2 do not connect filter capacitor for half-wave rectifying circuit;
Output voltage waveform when Fig. 2-3 connect filter capacitor for half-wave rectifying circuit;
Fig. 3-1 is the circuit diagram of full-wave rectifying circuit;
Fig. 3-2 are the output voltage waveform of all-wave (or bridge-type) rectification circuit while not connecing filter capacitor;
Fig. 3-3 are the output voltage waveform of all-wave (or bridge-type) rectification circuit while connecting filter capacitor;
Fig. 4-1 is the circuit diagram of bridge rectifier;
Fig. 4-2 are the circuit diagram of the simple and easy technique of painting of bridge rectifier;
Fig. 4-3 are the another kind of technique of painting of bridge rectifier;
Fig. 5-1 is the voltage oscillogram before certain industrial area electrical network is on duty;
Fig. 5-2 are the voltage oscillogram after certain industrial area electrical network is on duty;
Fig. 6-1 is for being used the oscillogram of controllable silicon technology after rectification;
Fig. 6-2 are for being used the oscillogram of bidirectional triode thyristor technology before rectification;
Fig. 7-1 is the circuit block diagram of first embodiment of the invention;
Fig. 7-2 are the physical circuit reason figure of the first embodiment;
Fig. 7-3 are the measured waveform figure of the first embodiment under input voltage 110V/50Hz;
Fig. 7-4 are the measured waveform figure of the first embodiment under input voltage 71V/50Hz;
Fig. 7-5 be the first embodiment under input voltage 110V/50Hz, have a measured waveform figure of filter capacitor;
Fig. 8 is another kind of voltage detecting circuit;
Fig. 9 is the circuit diagram of second embodiment of the invention;
Figure 10 is another kind of constant-current source;
Figure 11 is the circuit diagram of third embodiment of the invention;
Figure 12 is another kind of output circuit;
Figure 13 is the circuit diagram of fourth embodiment of the invention;
Figure 14-1 is the circuit block diagram of fifth embodiment of the invention;
Figure 14-2 are the physical circuit reason figure of the 5th embodiment;
Figure 14-3 are the measured waveform figure of the 5th embodiment under input voltage 110V/50Hz;
Figure 14-4 are the 5th embodiment under input 110V/50Hz, have the measured waveform figure of filter capacitor;
Figure 15 is the circuit diagram of sixth embodiment of the invention;
Figure 16 is the circuit diagram of seventh embodiment of the invention;
Figure 17 is the circuit diagram of eighth embodiment of the invention;
Figure 18 is the non-isolation of AC/DC small-power provided by the invention, insulating power supply circuit topology.
Embodiment
the first embodiment
Fig. 7-1 is the circuit block diagram of the first embodiment, and Fig. 7-2 are the circuit reason figure of the first embodiment.Fig. 7-1 block diagram has clearly represented the annexation of technique scheme one, comprises rectification circuit 102, voltage detecting circuit 103, constant-current source 104, output circuit 105, the ac input end 106 of rectification circuit connects and exchanges input, and the ac input end 106 of rectification circuit has two, can exchange in theory, does not distinguish too here, rectification circuit output end 107 and 108 shunt voltage testing circuits, voltage detecting circuit 103 has three ports at least, and that voltage detecting is inputted is positive 109, voltage detecting input is negative 110, voltage detecting output 111, constant-current source 104 has two ports at least, flows into end 112 and outflow end 113, 105 at least three ports of output circuit, input port 114 and output port 115, and control port 116, voltage detecting is inputted positive 109 connection rectification circuits 102 and is exported positive 107, voltage detecting input negative 110 connects the output negative 108 of rectification circuit 102, voltage detecting output 111 is connected to the control port 116 of output circuit 105, be connected to the outflow end 113 of constant-current source 104 simultaneously, the inflow end 112 of constant-current source 104 is connected to rectification circuit 102 and exports positive 107, rectification circuit 102 outputs negative 108 are also connected to the input port 114 of output circuit 105, the output port 115 of output circuit 105 is that the output of AC-DC circuit of the present invention is negative, rectification circuit is just being exported positive 107 outputs that are AC-DC circuit of the present invention.
Operation principle of the present invention is, rectification circuit 102 is Rectified alternating current commercial power rectification, the waveform of Rectified alternating current is shown in Fig. 2-2 or Fig. 3-2, voltage detecting circuit 103 is along with rectification circuit 102 output voltage instantaneous value voltages rise, the Absorption Current I2 of the voltage detecting output 111 of voltage detecting circuit 103 is larger, the electric current I 1 of constant-current source 104 is absorbed manyly, constant-current source 104 is less to the electric current I 3 of the control port 116 of output circuit 105, and the output current of output circuit 105 is exactly the electric current I 3 of amplifying its control port 116.Realized:
Less than predeterminated voltage value at rectification circuit 102 output voltage instantaneous values, the Absorption Current I2 of voltage detecting output 111 is less than the electric current I of constant-current source 104 1, and the control port 116 of output circuit 105 has electric current to flow through, instantaneous voltage after output circuit output rectification;
Identical with predeterminated voltage value at rectification circuit 102 output voltage instantaneous values, the Absorption Current I2 of voltage detecting output 111 is identical with the electric current I 1 of constant-current source 104, and the control port 116 of output circuit does not have electric current to flow through, output circuit no-output;
Larger than predeterminated voltage value at rectification circuit 102 output voltage instantaneous values, the Absorption Current I2 of voltage detecting output 111 is larger than the electric current I of constant-current source 1, because the electric current I 1 of constant current stream 104 no longer increases, voltage detecting output 111 Absorption Current I2 can only equate with the electric current I of constant-current source 104 1, the control port 116 of output circuit 105 does not have electric current to flow through, output circuit 105 no-outputs.
Capacitor C L and load resistance RL draw for implementation result is described.
Fig. 7-2 are the physical circuit figure of the first embodiment, and below with one group of experimental data and the effect of the first embodiment Fig. 7-1 is described in conjunction with operation principle, the parameter of circuit is as follows:
Resistance R 21 is 51K Ω, and resistance R 22 is 10M Ω, and resistance R 23 is 1K Ω, and triode TR21, triode TR22 are the NPN triode of 2N5551 model;
Constant-current source 104 is made up of resistance R 24 and resistance R 25 and positive-negative-positive triode TR23 and positive-negative-positive triode TR24, the annexation of this circuit is known technology, can be referring to " Basic Analog Electronics " second edition of being edited by Tong Shibai, this book be for No. ISBN 7-04-000868-8/TN53,266 pages of figure P3-21,270 pages of figure P3-32 in " Basic Analog Electronics ", so here no longer describe in detail, its continuous current is about:
formula (1)
In formula, Io is the continuous current of the collector electrode of triode TR24 in Fig. 7-2, i.e. I1 in Fig. 7-1, and UBE is base stage, the emitter voltage drop of triode TR23, silicone tube is generally got 0.6V left and right, also can be according to measured value substitution, R
25for the resistance of resistance R 25.
In the time that certain reason makes the collector current of triode TR24 become large, the emitter current of triode TR24 can synchronously become large, the pressure drop of this electric current in resistance R 25 becomes large, make the base current of triode TR23 become large, triode TR23 has amplified this base current, it is large that its collector current becomes, and make the base voltage of triode TR24 increase, thereby the collector current of triode TR24 is returned to the numerical value of formula (1).
In the time that certain reason diminishes the collector current of triode TR24, the emitter current of triode TR24 can synchronously diminish, the pressure drop of this electric current in resistance R 25 diminishes, the base current of triode TR23 is diminished, triode TR23 is tending towards cut-off, triode TR23 collector current diminishes, and the base voltage of triode TR24 is declined, thereby the collector current of triode TR24 is returned to the numerical value of formula (1).
Table one
In table, operating voltage refers to the lower end of resistance R 24, connects that end of 108 voltage to 112 ends, finds out from upper table, substantially realizes constant-current characteristics.
Voltage stabilizing didoe D21 is that 3.3V voltage-stabiliser tube, NPN type triode TR25 are that two, the NPN triode of A42 model is composited.
The operation principle of circuit is identical with the operation principle in technical scheme in summary of the invention, repeats no more here.
In order to measure conveniently, capacitor C L is 47uF/100V electrochemical capacitor, and load resistance RL is the adjustable resistance of 1-10K Ω.
After circuit general assembly completes, first do not meet capacitor C L, as shown in Fig. 7-2, first observe 108 to 107 waveform with oscillographic 2 passages, record, observe again the waveform of AC-DC circuit output end of the present invention with oscillographic 1 passage, i.e. the waveform of 115 end to 107 ends, oscillographic model is the TDS3012C of Tyke (Tektronix) company.If measure simultaneously, due to 1 passage and 2 passages not altogether, one of them passage will add the first wife's of Imtech isolation probe.The label of passage is left side in the drawings, and the numeral " 1 " of 1 passage is in the little frame of white, and the numeral " 2 " of 2 passages is in the little frame of black.
Fig. 7-3 are measured waveform, add exactly the waveform of isolation probe actual measurement, and the interchange of input is 110V/50Hz, can find out from 2 passage waveforms, and the distortion of alternating current half-wave own is larger, and the condition that is limited to is limit, and do not find comparatively perfectly sinusoidal wave for measuring.Can find out from the waveform of passage 1, each half-wave, circuit turn-on twice of the present invention, the peak value of input half-wave is 152V, but circuit output voltage peak value of the present invention is 37.2V.
Input AC is reduced to 71V/50Hz left and right, and measured waveform is shown in Fig. 7-4, and the peak value of input half-wave is for also dropping to 100V, but circuit output voltage peak value of the present invention is still 37.2V.
Being output voltage of the present invention does not have associatedly with input voltage, completes by circuit self parameter and determines.Realize in the constant situation of load voltage stabilizing output.
Access capacitor C L, add filter capacitor, load resistance RL is 1K Ω, actual measurement output waveform is as shown in Fig. 7-5, and in Fig. 7-5, the curve of top is the waveform at load resistance two ends, obtains comparatively level and smooth direct current, can find out, each half-wave charging twice, note: prior art is that each half-wave charges once.
In fact,, for those skilled in the art,, just can obtain different output voltages and maximal integer mass flow electric current the parameter adjustment of each device once.
Visible, the present invention no matter principle, or from experimentally, has verified and can realize goal of the invention.
the second embodiment
The voltage detecting circuit of Fig. 8 is by resistance R 201, resistance R 202, resistance R 203 and triode TR201 composition, it is one end of resistance R 202 that voltage detecting inputs positive 109, resistance R 202 other ends are connected with resistance R 201, tie point is connected to the base stage of triode TR201 simultaneously, resistance R 201 other ends are connected with resistance R 203 one end, tie point forms voltage detecting input negative 110, resistance R 203 other ends are connected with the emitter of triode TR201, the current collection of triode TR201 is voltage detecting output 111 very, in fact, this circuit is the known common emitter amplifying circuit of standard, 109 to 110 added voltages are input voltage, be made as Vin, the Absorption Current I2 of voltage detecting output 111 is so:
formula (2)
Wherein, Ube is generally 0.5V to 0.8V, for the base stage of triode TR201 is to emitter conduction voltage drop, common calculating is got between 0.6V to 0.7V, can find out from formula (2), the collector current of triode TR201 is proportional to input voltage vin, be that the Absorption Current of voltage detecting circuit is along with operating voltage raises and increases, be that voltage detecting output 111 Absorption Currents of Fig. 8 are along with operating voltage raises and increases, its maximum current is limited by the constant-current source 104 in Fig. 7-1, when the electric current of constant-current source 104 is consumed by Fig. 8 voltage detecting output 111 Absorption Currents completely, so in Fig. 7-1, output circuit 105 will not exported completely., rectification point of the present invention can be by setting in advance realization.
The schematic diagram of the second embodiment is shown in Fig. 9, remove voltage detecting circuit 103 different with the first embodiment, the parameter of other part is identical, in Fig. 9, the device parameters of voltage detecting circuit 103 is: resistance R 201 is that 270K Ω, resistance R 202 are that 9.1M Ω, resistance R 203 are 5.1K Ω, and triode TR201 model is S9014.
Actual measurement at 110V/50Hz and following, can realize goal of the invention at input AC, and its output characteristic and Fig. 7-3, Fig. 7-4, Fig. 7-5 are almost in full accord, and in above three figure, the measured value of Ch1 is respectively 37.9V, 37.9V and 26.5V.
The operation principle of circuit is identical with the operation principle in technical scheme in summary of the invention, repeats no more here.
In fact,, for those skilled in the art,, just can obtain different output voltages and maximal integer mass flow electric current the parameter adjustment of each device once.
the 3rd embodiment
Constant-current source 104 in Fig. 7-2 is replaced by the another kind of constant-current source circuit of circuit shown in Figure 10, and when replacing, strict annexation of pressing in the first embodiment, just can obtain the 3rd embodiment, and shown in Figure 11 is the 3rd embodiment schematic diagram.The constant-current source 104 of Figure 10 is made up of resistance R 204, resistance R 205, diode D201, diode D202 and triode TR204, the anode of diode D201 is connected with resistance R 205, tie point forms the inflow end 112 of constant-current source 104, the anodic bonding of the negative electrode of diode D201 and diode D202, the negative electrode of diode D201 is connected with resistance R 204, tie point is connected to the base stage of triode TR204 simultaneously, the emitter of triode TR204 is connected with the other end of resistance R 205, and the current collection of triode TR204 is the outflow end 113 of constant-current source 104 very; The output negative 108 of another termination rectification circuit 102 of resistance R 204.
In fact, this circuit is known constant-current source circuit, and its continuous current I1 is:
Wherein, Ube is generally 0.5V to 0.8V, and for triode TR204 base stage is to emitter conduction voltage drop, common calculating is got between 0.6V to 0.7V, U
d201and U
d202be respectively diode D201 and the forward conduction voltage drop of diode D202 in circuit, R205 is the resistance of resistance R 205.Because U
d201and U
d202approximately equal with Ube, simple algorithm is exactly to use the resistance of the forward conduction voltage drop of diode in circuit divided by resistance R 205.
The schematic diagram of the 3rd embodiment is shown in Figure 11, remove constant-current source 104 different with the first embodiment, the parameter of other part is identical, and in Figure 11, the device parameters of voltage constant-current source 104 is: resistance R 205 is that 5.1K Ω, resistance R 204 are that 3.9M Ω, triode TR24 are the PNP triode of A92 model.Realize equally the constant-current source of 100uA left and right.
Actual measurement at 110V/50Hz and following, can realize goal of the invention at input AC, and its output characteristic and Fig. 7-3, Fig. 7-4, Fig. 7-5 are almost in full accord, and in above three figure, the measured value of Ch1 is respectively 37.6V, 37.6V and 26.4V.
The operation principle of circuit is identical with the operation principle in technical scheme in summary of the invention, repeats no more here.
In fact,, for those skilled in the art,, just can obtain different output voltages and maximal integer mass flow electric current the parameter adjustment of each device once.
the 4th embodiment
105 at least three ports of output circuit, input port 114 and output port 115, and control port 116;
In the time there is electric current in the collector electrode of triode TR25, inject the base stage of triode TR26, collector electrode through triode TR26 after triode TR26 amplifies is exported, difference is, the output port 115 of output circuit 105 develop into the present embodiment AC-DC circuit output just, it is negative that rectification circuit output negative 108 is the outputs of AC-DC circuit of the present invention.
The schematic diagram of the 4th embodiment is shown in Figure 13, and different with the first embodiment except output circuit 105, operation principle is except output circuit 105 this part difference, and other is identical, repeats no more here.
Equally, for those skilled in the art,, just can obtain different output voltages and maximal integer mass flow electric current the parameter adjustment of each device once.
The rectification circuit of first to fourth embodiment is changed into bridge rectifier, equally realize goal of the invention.
the 5th embodiment
Figure 14-1 is the circuit block diagram of the 5th embodiment, and Figure 14-2 are the circuit diagram of the 5th embodiment.Figure 14-1 block diagram has clearly represented the annexation of technique scheme two, comprises rectification circuit 102, voltage detecting circuit 103, constant-current source 104, output circuit 105, the ac input end 106 of rectification circuit connects and exchanges input, and the ac input end 106 of rectification circuit has two, can exchange in theory, does not distinguish too here, the output 107 and 108 shunt voltage testing circuits of rectification circuit 102, voltage detecting circuit 103 has three ports at least, and that voltage detecting is inputted is positive 109, voltage detecting input is negative 110, voltage detecting output 111, constant-current source 104 has two ports at least, flows into end 112 and outflow end 113, 105 at least three ports of output circuit, input port 114 and output port 115, and control port 116, voltage detecting is inputted positive 109 connection rectification circuits 102 and is exported positive 107, voltage detecting input negative 110 connects the output negative 108 of rectification circuit 102, voltage detecting output 111 is connected to the control port 116 of output circuit 105, be connected to the inflow end 112 of constant-current source 104 simultaneously, the outflow end 113 of constant-current source 104 is connected to rectification circuit 102 outputs negative 108, rectification circuit 102 is exported positive 107 input ports 114 that are also connected to output circuit 105, the output port 115 of output circuit 105 be AC-DC circuit of the present invention output just, rectification circuit 102 outputs negative 108 are the output of AC-DC circuit of the present invention and bear.
Capacitor C L and load resistance RL draw for implementation result is described.
Figure 14-2 are the physical circuit reason figure of the 5th embodiment, and below, with one group of experimental data and in conjunction with the effect of operation principle explanation the 5th embodiment Figure 14-1, the parameter of circuit is as follows:
Constant-current source 104 is made up of resistance R 24 and resistance R 25 and NPN type triode TR23 and NPN type triode TR24, the annexation of this circuit is known technology, that one end that resistance R 24 is not connected with triode TR24 base stage is connected to rectification circuit 102 and exports positive 107, the current collection of triode TR24 is the inflow end 112 of constant-current source 104 very, the tie point of the emitter of triode TR23 and resistance R 25 is the outflow end 113 of constant-current source 104, its operation principle is with the constant-current source in the first embodiment, be only the polarity difference of triode, repeat no more here.
Operation principle of the present invention is, rectification circuit 102 is Rectified alternating current commercial power rectification, the waveform of Rectified alternating current is shown in Fig. 2-2 or Fig. 3-2, voltage detecting circuit 103 is along with rectification circuit 102 output voltage instantaneous value voltages rise, the voltage detecting output 111 Absorption Current I2 of voltage detecting circuit 103 are larger, the electric current I 1 of constant-current source 104 is absorbed manyly, constant-current source 104 is less to the electric current I 3 of the control port 116 of output circuit 105, and the output current of output circuit 105 is exactly the electric current I 3 of amplifying its control port 116.Realized:
Less than predeterminated voltage value at rectification circuit 102 output voltage instantaneous values, the Absorption Current I2 of voltage detecting output 111 is less than the electric current I of constant-current source 104 1, and the control port 116 of output circuit 105 has electric current to flow through, instantaneous voltage after output circuit output rectification;
Identical with predeterminated voltage value at rectification circuit 102 output voltage instantaneous values, the Absorption Current I2 of voltage detecting output 111 is identical with the electric current I 1 of constant-current source 104, and the control port 116 of output circuit does not have electric current to flow through, output circuit no-output;
Larger than predeterminated voltage value at rectification circuit 102 output voltage instantaneous values, the Absorption Current I2 of voltage detecting output 111 is larger than the electric current I of constant-current source 1, because the electric current I 1 of constant current stream 104 no longer increases, voltage detecting output 111 Absorption Current I2 can only equate with the electric current I of constant-current source 104 1, the control port 116 of output circuit 105 does not have electric current to flow through, output circuit 105 no-outputs.
Can realize goal of the invention, carry out description effect below with one group of measured data, in order to measure conveniently, capacitor C L is 47uF/100V electrochemical capacitor, and load resistance RL is the adjustable resistance of 1-10K Ω.In Figure 14-2, diode D22, diode D23, diode D24, diode D25 are 1N4007, and voltage stabilizing didoe D21 is 5.1V voltage-stabiliser tube; Resistance R 21 is 51K Ω, and resistance R 22 is 20M Ω, and resistance R 23 is 1K Ω, and resistance R 24 is 3.3M Ω, and resistance R 25 is 5.6K Ω, and triode TR21, triode TR22 are the PNP triode of 2N5401 model; Triode TR23, triode TR24 are the NPN triode of 2N5551 model; Triode TR25a and TR25b model are A92.
After circuit general assembly completes, first do not meet capacitor C L, as shown in Figure 14-2, with the waveform of oscillographic 2 passages observations 108 to 107, observe the waveform of AC-DC circuit output end of the present invention with oscillographic 1 passage simultaneously, the i.e. waveform of 115 end to 108 ends, connects on 108 to oscillographic input, and oscillographic model is the TDS3012C of Tyke (Tektronix) company.The label of passage is left side in the drawings, and the numeral " 1 " of 1 passage is in the little frame of white, and the numeral " 2 " of 2 passages is in the little frame of black.
Figure 14-3 are measured waveform, and the interchange of input is 110V/50Hz, can find out from 2 passage waveforms, and the distortion of alternating current half-wave own is larger, and the condition that is limited to is limit, and do not find comparatively perfectly sinusoidal wave for measuring.Can find out from the waveform of passage 1, each half-wave, circuit turn-on twice of the present invention, the peak value of input half-wave is 157V, but circuit output voltage peak value of the present invention is 83.0V.
Input AC is reduced to 71V/50Hz left and right, and the peak value of input half-wave is for also dropping to 100V, but circuit output voltage peak value of the present invention is still 83.0V, meets operation principle.Being output voltage of the present invention does not have associatedly with input voltage, completes by circuit self parameter and determines.Realize in the constant situation of load voltage stabilizing output.
Meet capacitor C L, add filter capacitor, load resistance RL is 1K Ω, and actual measurement output waveform is as shown in Figure 14-4, and in Figure 14-4, the curve of top is the waveform at load resistance two ends, obtain comparatively level and smooth direct current, magnitude of voltage is about 66.2V, can find out, twice of each half-wave charging, note: prior art is that each half-wave charges once.
Visible, the present invention no matter principle, or from experimentally, has verified and can realize goal of the invention.
In fact,, for those skilled in the art,, just can obtain different output voltages and maximal integer mass flow electric current the parameter adjustment of each device once.Adopt the method for the second embodiment, the 3rd embodiment, the 4th embodiment, replace by other rectification circuit 102, voltage detecting circuit 103, constant-current source 104, output circuit 105 difference or combination in any, equally can realize goal of the invention.
The 6th embodiment
Shown in Figure 15, change 103 in Figure 14-2 with voltage detecting circuit in Figure 15 103 exactly, in Figure 15, voltage detecting circuit 103 is by resistance R 21, resistance R 22, resistance R 23, diode D26, and positive-negative-positive triode TR22 composition, resistance R 21 is connected with resistance R 23 one end, tie point forms voltage detecting and inputs positive 109, the other end of resistance R 21 is connected with the anode of diode D26, the negative electrode of diode D26 is connected with the base stage of triode TR22, one end of this tie point contact resistance R22, the other end of resistance R 22 forms voltage detecting input negative 110; The other end of resistance R 23 is connected with the emitter of triode TR22, and the current collection of triode TR22 is voltage detecting output 111 very;
The 6th embodiment operation principle, with the 5th above-mentioned embodiment, equally can realize goal of the invention.
The 7th embodiment
Shown in Figure 16, change 104 in Figure 14-2 with constant-current source in Figure 16 104 exactly, in Figure 16, constant-current source 104 is made up of resistance R 24 and resistance R 25 and NPN type triode TR24 and voltage stabilizing didoe D27, the annexation of this circuit is known technology, the anode of voltage stabilizing didoe D27 is connected with resistance R 24, and be connected with triode TR24 base stage, that one end that resistance R 24 is not connected with triode TR24 base stage is connected to rectification circuit 102 and exports positive 107, the current collection of triode TR24 is the inflow end 112 of constant-current source 104 very, the tie point of the negative electrode of voltage stabilizing didoe D27 and resistance R 25 is the outflow end 113 of constant-current source 104, realize equally constant-current source.
The 7th embodiment operation principle, with the 5th above-mentioned embodiment, equally can realize goal of the invention.
The 8th embodiment
Figure 17 shows the 8th embodiment, on the 7th embodiment basis, as shown in figure 17, increase a voltage detecting circuit 118, voltage detecting circuit 118 has three ports at least, and that voltage detecting is inputted is positive 119, voltage detecting input is negative 120, voltage detecting output 121; Voltage detecting circuit 118 is identical with voltage detecting circuit 103 functions in fact, 109,110,111 3 ports of 119,120,121 difference corresponding voltage testing circuits 103 of voltage detecting circuit 118.
The voltage detecting of voltage detecting circuit 118 is inputted positive 119 and is connected on the output port 115 of output circuit 105, the voltage detecting input negative 120 of voltage detecting circuit 118 is connected to the output of AC-DC circuit of the present invention and bears, on 108, the voltage of voltage detecting circuit 118 checks that output 121 is connected in constant-current circuit, guarantee in the time of output port 115 output overvoltage, triode TR27 conducting, turn off constant-current source, like this, the control port 116 of output circuit is not worked owing to there is no electric current, turn off output, like this, guarantee that the output voltage of output is about:
The terminal voltage of resistance R 27 is limited by the conduction voltage drop of triode TR27, utilizes so this point, just can obtain formula (4), wherein U
d28for the voltage stabilizing value of voltage stabilizing didoe D28.
The 8th embodiment not only can realize goal of the invention, and can realize comparatively accurate output voltage stabilizing, and as the further improvement of the 8th embodiment, 119 ends are connected on the output of filter network, can realize so less ripple voltage output.
If " load resistance RL " in above-described embodiment circuit, replace with the DC/DC circuit of non-isolation, isolation features, as self-excitation push-pull converter, RCC (Ringing Choke Converter) converter, anti exciting converter circuit (Flyback Converter), just can realize AC/DC small-power insulating power supply, comprise voltage stabilizing output and non-voltage stabilizing output.Figure 18 has just provided this application circuit topology, wherein 122 be DC/DC converter (Switching Power Supply), equally, owing to not using high pressure polarity free capacitor or high-voltage electrolytic capacitor, AC/DC small-power insulating power supply of the present invention can be realized miniaturization equally, and does not have impulse current in the time of start.
If 122 in Figure 18 is a pfc circuit, this circuit can be worked equally.
Below be only the preferred embodiment of the present invention, it should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claim limited range.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, as adopt known triode multiple tube to replace corresponding triode; With positive-negative-positive triode replacement NPN type triode, and power input voltage polarity conversely, use the DC/DC converter of piezoelectric ceramic technology as isolation, use field effect transistor to replace above-mentioned triode.These improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. an AC-DC circuit, is characterized in that:
Comprise rectification circuit, voltage detecting circuit, constant-current source, output circuit;
Described rectification circuit is Rectified alternating current AC rectification;
Described constant-current source provides electric current to the control port of the voltage detecting output of described voltage detecting circuit and described output circuit, the electric current sum that the electric current that the electric current flowing through in described constant-current source provides to described voltage detecting circuit for described constant-current source and described constant-current source provide to described output circuit;
Described voltage detecting circuit is along with described Output Voltage in Rectified Circuits instantaneous value rises, the voltage detecting output Absorption Current of described voltage detecting circuit is larger, the electric current of described constant-current source is absorbed manyly, and described constant-current source is less to the electric current of the control port of described output circuit;
Described output circuit is exported after amplifying the electric current of its control port, and described output current is to the follow-up load supplying of described AC-DC circuit.
2. AC-DC circuit according to claim 1, is characterized in that: the output current of described constant-current source flows to respectively described voltage detecting circuit and described output circuit.
3. AC-DC circuit according to claim 1, is characterized in that: the electric current sum that the electric current that described constant-current source provides to voltage detecting circuit and described constant-current source provide to output circuit flows into described constant-current source.
4. AC-DC circuit according to claim 1, is characterized in that: the output of described output circuit is also connected with a voltage detecting circuit.
5. the application of the arbitrary described AC-DC circuit of claim 1 ~ 4 in AC/DC small-power power.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210056555.9A CN102594175B (en) | 2012-03-06 | 2012-03-06 | Alternating current-to-direct current circuit |
| DE112012005986.7T DE112012005986T5 (en) | 2012-03-06 | 2012-04-28 | AC / DC circuit |
| PCT/CN2012/074878 WO2013131315A1 (en) | 2012-03-06 | 2012-04-28 | Alternating current-to-direct current circuit |
| JP2014550611A JP5810229B2 (en) | 2012-03-06 | 2012-04-28 | Electrical circuit that converts alternating current to direct current |
| US14/357,215 US9438133B2 (en) | 2012-03-06 | 2012-04-28 | Alternating current-to-direct current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210056555.9A CN102594175B (en) | 2012-03-06 | 2012-03-06 | Alternating current-to-direct current circuit |
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| Publication Number | Publication Date |
|---|---|
| CN102594175A CN102594175A (en) | 2012-07-18 |
| CN102594175B true CN102594175B (en) | 2014-06-25 |
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| CN201210056555.9A Active CN102594175B (en) | 2012-03-06 | 2012-03-06 | Alternating current-to-direct current circuit |
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| Country | Link |
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| US (1) | US9438133B2 (en) |
| JP (1) | JP5810229B2 (en) |
| CN (1) | CN102594175B (en) |
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| WO (1) | WO2013131315A1 (en) |
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| CN103424601B (en) * | 2013-08-21 | 2015-08-19 | 矽力杰半导体技术(杭州)有限公司 | A kind of voltage detecting circuit |
| US10141842B2 (en) * | 2015-07-03 | 2018-11-27 | Philips Lighting Holding B.V. | Power converter and an LED lighting circuit comprising the same |
| CN105577003B (en) | 2016-01-21 | 2017-12-29 | 广州金升阳科技有限公司 | A kind of Switching Power Supply with APFC |
| CN105491728B (en) | 2016-01-21 | 2017-05-24 | 广州金升阳科技有限公司 | Direct filtering type switching power supply |
| CN105527524B (en) | 2016-01-21 | 2018-03-27 | 广州金升阳科技有限公司 | A kind of Switching Power Supply indicating circuit and its application method |
| CN107071961A (en) * | 2017-01-18 | 2017-08-18 | 中山市美耐特光电有限公司 | It is a kind of effectively to weaken the high-voltage LED light bar of stroboscopic phenomenon |
| US11971735B2 (en) * | 2019-11-01 | 2024-04-30 | Texas Instruments Incorporated | Low area frequency compensation circuit and method |
| CN111857224A (en) * | 2020-07-31 | 2020-10-30 | 深圳君略科技有限公司 | Multistage chip series circuit and driving system |
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- 2012-04-28 JP JP2014550611A patent/JP5810229B2/en active Active
- 2012-04-28 DE DE112012005986.7T patent/DE112012005986T5/en not_active Withdrawn
- 2012-04-28 US US14/357,215 patent/US9438133B2/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2015503899A (en) | 2015-02-02 |
| US9438133B2 (en) | 2016-09-06 |
| WO2013131315A1 (en) | 2013-09-12 |
| CN102594175A (en) | 2012-07-18 |
| DE112012005986T5 (en) | 2015-05-28 |
| US20140376290A1 (en) | 2014-12-25 |
| JP5810229B2 (en) | 2015-11-11 |
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